(1 point) Estimate the area under the graph of $f(x) = x^2 + 4x$ from $x = 1$ to $x = 7$ using 3 approximating rectangles and left endpoints. Approximation =
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Since we are using 3 rectangles, we divide the interval [2, 6] into 3 equal parts. The width of each rectangle is (6-2)/3 = 4/3. Show more…
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